In “Swann’s Way,” the first of the seven books that made up Marcel Proust’s famous À la recherche du temps perdu (Remembrance of Things Past), it happened this way:
The narrator, upon a taste of a madeleine dipped in tea, is suddenly flooded with a long-forgotten memory from his childhood.

Wandering North Hollywood
Here’s how it happened to me:
I had to get the car serviced, so had a couple hours to kill in North Hollywood. On the particular stretch of Lankershim Boulevard where the dealership is located, there ain’t much to see. So I set out to wandering. I had gone in and out of the 99 Cent Store, walked under the U.S. 101 overpass, glanced at the menu of an old school French restaurant housed in a small faux chateaux, and was wishing the couple of legit dive bars in the neighborhood opened a little earlier, when I spotted it: H. Salt Fish & Chips. More